PHP crypt(),UPDATE和Comparisons

时间:2015-02-20 11:23:50

标签: php mysql session

我正在为我的网站创建更改密码网站,我的代码存在一些问题......

由于某种原因,我在密码被比较后在数据库中进行比较和替换时遇到了困难。

我想要这个:

获取当前用户密码并将其与$ oldpass的输入值进行比较,或将$ oldpass的输入值与当前用户存储在数据库中的密码进行比较。

检查$ oldpass和数据库中的密码是否匹配,如果它们匹配,则取$ newpass和$ repeatpass的输入值,比较它们,如果它们匹配,则使用crypt()$ newpass并更新数据库新密码。

我甚至不确定密码是否被加密。

同样在代码中我将$ oldpass与$ _SESSION ['password']进行比较,这不是db的密码,我无法弄清楚如何从db调用密码。

    <?php

include 'check_login_status.php';

$u="";
$oldpass=md5($_POST['oldpass']);
//stripping both strings of white spaces
$newpass = preg_replace('#[^a-z0-9]#i', '', $_POST['newpass']);
$repeatpass = preg_replace('#[^a-z0-9]#i', '', $_POST['repeatpass']);

//get the username from the header
if(isset($_GET["u"])){
    $u = preg_replace('#[^a-z0-9]#i', '', $_GET['u']);
} else {
    header("location: compare_pass.php?u=".$_SESSION["username"]);
    exit(); 
}

// Select the member from the users table
$sql = "SELECT password FROM users WHERE username='$u' LIMIT 1";
mysqli_query($db_conx, $sql);
$user_query = mysqli_query($db_conx, $sql);
// Now make sure that user exists in the table
$numrows = mysqli_num_rows($user_query);
if($numrows < 1){
    echo "That user does not exist or is not yet activated, press back";
    exit(); 
}

if ($oldpass == $_SESSION['password']) {
    echo "session and oldpass are matching";
} else {
    echo "Session and oldpass do not match!";
}

$isOwner = "no";
//check if user is logged in owner of account
if($u == $log_username && $user_ok == true){
    $isOwner = "yes";
}
$newpass = password_hash($newpass, PASSWORD_BCRYPT);

if (isset($_POST["submit"]) && ($isOwner == "yes") && ($user_ok == true) && ($newpass == $repeatpass)) {
    $newpass = password_hash($newpass, PASSWORD_BCRYPT);
    $sql = "UPDATE users SET `password`='$newpass' WHERE username='$u' LIMIT 1";
}

if (mysqli_query($db_conx, $sql)) {
    echo "Record updated successfully";

} else {
    echo "Error updating record: " . mysqli_error($db_conx);
    }

?>

<h3>Create new password</h3>
  <form action="" method="post">
    <div>Current Password</div>
    <input type="text" class="form-control" id="password" name="oldpass" ><?php echo "{$oldpass}"; ?>
    <div>New Password</div>
    <input type="text" class="form-control" id="password" name="newpass" ><?php echo "{$newpass}"; ?>
    <div>Repeat Password</div>
    <input type="text" class="form-control" id="password" name="repeatpass" ><?php echo "{$repeatpass}"; ?>
    <br /><br />
    <input type="submit" name="submit" value="Submit"> 
    <p id="status" ></p>
  </form><?php echo "{$oldpass}, {$_SESSION['password']}"; ?>


  <pre>
  <?php
  var_dump($_SESSION);
    var_dump($oldpass);

    var_dump($newpass);
    var_dump($repeatpass);
    ?>
  </pre>

1 个答案:

答案 0 :(得分:0)

Ther是解决问题的一种更简单的方法:

// Hash a new password for storing in the database.
// The function automatically generates a cryptographically safe salt.
$hashToStoreInDb = password_hash($password, PASSWORD_BCRYPT);

// Check if the hash of the entered login password, matches the stored hash.
// The salt and the cost factor will be extracted from $existingHashFromDb.
$isPasswordCorrect = password_verify($password, $existingHashFromDb);

算法MD5不是保护密码的好选择,因为它的设计速度很快,而且很容易被强制使用。

在会话中存储密码/哈希不是很有帮助,如果您知道它是同一个用户,您知道他是否已经登录,只需在会话中存储指示符,如$ _SESSION [&#39; is_logged_in& #39;]或只是用户名$ _SESSION [&#39;用户名&#39;]。